Final answer:
The Past Perfect tense is used to express an action that occurred before another action in the past.
Step-by-step explanation:
The correct answer is B. Past Perfect.
The Past Perfect tense is used to express an action that occurred before another action in the past. It is formed by using the auxiliary verb 'had' followed by the past participle of the main verb. For example, 'I had already finished my homework when my mom arrived'.
In this sentence, 'had finished' indicates that the action of finishing homework happened before the action of the mom arriving.